Part of the Day · BAT54 — SOT-23 Schottky diode (marking JV3)

Part of the Day · 2026-10-23

An SMD small-signal Schottky diode with low forward voltage and fast switching. It is used for high-speed switching, circuit protection and voltage clamping, and is marked JV3.

Actual size

↓ Actual size, left edge aligned to 0 on the ruler

One ruler tick = 1mm. On PC this is actual size on a 24-inch FHD monitor at 100% zoom; on iPhone it adjusts automatically. For other screens, use “Calibrate ruler” below.

Enlarged (SOT-23 · top view · approx. 20×)

Pins 1 Anode · 3 Cathode (onsemi pin diagram shows no function for pin 2)

Package SOT-23 · Marking JV3

Key specifications

Values are from the onsemi datasheet.

Marking and pins

Marking code JV3 · Pins 1 Anode · 3 Cathode (onsemi pin diagram shows no function for pin 2)

Typical uses

• High-speed switching, reverse-polarity protection
• Signal-line voltage clamping

Companion & similar parts

• BAT54S · BAT54A · BAT54C — Dual-diode variant — internal connection and pins differ, not interchangeable
• SS34 — Also a Schottky, but a rectifier in an SMB package (40V, 3A)
• 1N4148 — Ordinary small-signal switching diode, not a Schottky — higher forward voltage

Marking code JV3 follows onsemi. Even within SOT-23 BAT54 parts, the S, A and C variants have different pin connections, so always distinguish them by marking code and datasheet.